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Wyświetlanie 1-15 z 19
Tytuł:
First Evidence of Interdependences between Incomes of Family Members
Autorzy:
Łukasiewicz, P.
Karpio, K.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1029572.pdf
Data publikacji:
2018-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
88.05.Lg
Opis:
In this paper we study the relations between personal incomes and incomes of families with two adults in USA. We describe family income distributions using the simple two-parametric model. Assuming incomes of spouses are statistically independent of each other we obtain theoretical exponential income distributions for males and females. We show that these distributions are not coincident with distributions constructed based on the personal data. Obtained results indicate on statistical dependence between incomes of males and females in the families. We track changes and trends in data for years from 2001 to 2016.
Źródło:
Acta Physica Polonica A; 2018, 133, 6; 1441-1444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Color Centers in $Ca_4GdO(BO_3)_3$ Single Crystals Irradiated by Gamma Quanta
Autorzy:
Potera, P.
Lukasiewicz, T.
Piecuch, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400491.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Fy
78.40.Ha
61.80.-x
78.20.-e
Opis:
The present work is devoted to investigation of optical absorption in pure $Ca_4GdO(BO_3)_3$ single crystals in the spectral range 0.2-1.1 μm induced under influence of the gamma quanta irradiation with absorbed dose $2 \times 10^3$ Gy. The effect of heating in air on the absorption spectrum of irradiated sample is also studied.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 122-124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Models of Personal Incomes in USA
Autorzy:
Łukasiewicz, P.
Karpio, K.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1409048.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.-s
89.65.Cd
Opis:
The shapes of distributions of personal incomes in USA have been investigated based on the data for 1993 to 2008. Comparisons between four models utilizing various number of parameters have been performed. The studies showed that the empirical data is described the best by the three-parameter Dagum model. Values of the models parameters indicate that the distribution of personal incomes can be regarded as zero-modal one. However, one-parameter exponential model shows a good agreement with data and can be treated as a good approximation of empirical distribution with the exception of the region with very high incomes. The high-income region is characterized by the relatively great number of events and is described much better by the Dagum distribution.
Źródło:
Acta Physica Polonica A; 2012, 121, 2B; B-82-B-85
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stock Indices for Emerging Markets
Autorzy:
Karpio, K.
Orłowski, A.
Łukasiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1538490.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
02.30.Nw
Opis:
Indices of selected financial markets from various parts of world, different sizes and levels of development are investigated. The local Hurst exponent is globally compared to log-prices. Periodic changes in correlation coefficient are quantified via discrete Fourier transform. Local Hurst exponents spectra are discussed for investigated markets.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 619-622
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Price-Volume Relationship in Polish Stock Market
Autorzy:
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1409003.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.-s
89.65.Gh
02.30.Nw
Opis:
A relationship between daily prices of Polish WIG index and trading volumes is investigated. By introducing variables related to a number of last prices and volumes, a history of values in a certain period of time (which could be regarded as an investor memory) is taken into account. Different characteristics of autocorrelations for prices and trading volumes are observed. By studying mutual correlations between the variables, a local maximum at about 100 trading days is discovered. The Granger causality test is performed, indicating very strong influence of prices on volumes. This property can be considered as a sign of markets maturity.
Źródło:
Acta Physica Polonica A; 2012, 121, 2B; B-61-B-66
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mining Associations on the Warsaw Stock Exchange
Autorzy:
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1400174.pdf
Data publikacji:
2013-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
07.05.Kf
07.05.Rm
Opis:
Identification of patterns in stock markets has been an important subject for many years. In the past, numerous techniques, both technical and econometric, were used to predict changes in stock markets, but dependences among all the companies listed on a stock market were considered in a limited extent. Numerous studies confirm that larger stocks items appear to influence smaller ones and that, on a global level, most of the world's stock markets are integrated. Therefore, this study implements the association rules using a data mining approach to explore the co-movement between stock items listed on the Warsaw Stock Exchange. We believe that in order to describe and to understand market's behavior, data mining techniques are more flexible in use than for instance pricing models based on a finance theory. The former seems to be more effective for explaining market behavior without making particular assumptions.
Źródło:
Acta Physica Polonica A; 2013, 123, 3; 553-559
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The quantile decomposition of personal income distributions in the USA
Autorzy:
Karpio, K.
Landmesser, J.
Łukasiewicz, P.
Orłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1075455.pdf
Data publikacji:
2016-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
88.05.Lg
Opis:
In this study we compared incomes distributions in the USA for two subgroups (defined according to sex or race). We utilized the quantile decomposition method to describe differences between the two distributions as a function of their quantiles. The analyzed objects are characterized by the set of attributes (education, age, etc.). We evaluate strength of the influence of the attributes onto the various parts of the incomes distributions. In such a way we evaluate income inequalities and their causes in two subgroups of people.
Źródło:
Acta Physica Polonica A; 2016, 129, 5; 965-970
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Q-Entropy Approach to Selecting High Income Households
Autorzy:
Gajowniczek, K.
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1388367.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
05.40.Ca
07.05.Kf
07.05.Mh
Opis:
A generalized algorithm for building classification trees, based on Tsallis q-entropy, is proposed and applied to classification of Polish households with respect to their incomes. Data for 2008 are used. Quality measures for obtained trees are compared for different values of q parameter. A method of choosing the optimum tree is elaborated.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-38-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microwave Techniques Investigations of ZnCoO Films Grown by Atomic Layer Deposition
Autorzy:
Łukasiewicz, M.
Cabaj, A.
Godlewski, M.
Guziewicz, E.
Wittlin, A.
Jaworski, M.
Wołoś, A.
Wilamowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1492931.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
68.55.Nq
78.66.Hf
81.15.Kk
Opis:
Electrical and magnetic properties of ZnCoO thin films grown on silicon substrates by atomic layer deposition method are investigated. The films were grown using reactive organic precursors of zinc and cobalt. The use of these precursors allowed us the significant reduction of a growth temperature to 200°C and below, which proved to be very important for the growth of uniform films of ZnCoO. We have measured the microwave AC conductivity and EPR for two types of ZnCoO samples, with different Co fractions.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 911-913
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of $GdCa_4O(BO_3)_3$ Single Crystals
Autorzy:
Bodzenta, J.
Kaźmierczak-Bałata, A.
Łukasiewicz, T.
Hofman, B.
Kucytowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811523.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Tv
42.70.Hj
65.40.-b
66.30.Xj
66.70.-f
Opis:
Single crystals of $GdCa_4O(BO_3)_3$ were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-27-A-32
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Topographic Studies of Defect Structure in $YVO_4$ Crystals
Autorzy:
Wieteska, K.
Wierzchowski, W.
Łukasiewicz, T.
Wierzbicka, E.
Malinowska, A.
Lefeld-Sosnowska, M.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1812259.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The perfection of $YVO_4$ crystals, which are predicted to replace formerly used YAG garnets due to higher quantum efficiency and lower excitation level, was studied. The investigations of Czochralski grown undoped $YVO_4$ single crystals were performed mainly by means of X-ray topographic methods. Both synchrotron and conventional X-ray sources were used. The study revealed relatively high density of weak point-like contrasts which can be most probably interpreted as dislocation outcrops. In regions of the crystal close to its boundary we observed glide bands. It was also found that in some regions the dislocations form local subgrain boundaries. The white beam back reflection and monochromatic beam topography allowed to evaluate a local misorientation which not exceeded several angular minutes. No segregation fringes were observed proving a good homogeneity of chemical composition.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 455-461
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Diffraction topography in Studying of the Defect Structure in Crystals Grown by the Czochralski Method
Autorzy:
Wierzchowski, W.
Wieteska, K.
Malinowska, A.
Wierzbicka, E.
Lefeld-Sosnowska, M.
Świrkowicz, M.
Łukasiewicz, T.
Pajączkowska, A.
Paulmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/1399483.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The synchrotron diffraction topography had been widely used for investigation of the structural defects in crystals grown by the Czochralski method. Similarly as conventional diffraction topography, the synchrotron topography consists in recording with high spatial resolution of the beam formed by the Bragg reflection from the crystal. The advantages of synchrotron sources come from the possibilities of using the wavelength from a wide spectral range, improved high spatial resolution and collimation of the beam as well as from shortening the time necessary for the investigation. The synchrotron diffraction topography includes experimentally simpler white beam topography and more complicated monochromatic beam (multicrystal) topography, where the beam is formed by monochromators. In the case of Czochralski-grown crystals the synchrotron diffraction topography can be used for studying of the individual dislocations and their complexes such as glide bands or sub-grain boundaries, individual blocks, twinning, the domain structure and various segregation effects negatively affecting crystal properties. In addition, the topographical investigation can provide information concerning the reasons for the generation of defects, useful in the improving of the technology. In the present paper the possibilities of the synchrotron diffraction topography are discussed on the basis of several investigations of the Czochralski-grown oxide and semiconductor crystals, performed by the authors at HASYLAB. The majority of the results concern the oxide crystals grown at the Institute of Electronic Materials Technology, in particular garnets, orthovanadates, mixed calcium barium and strontium niobates as well as praseodymium lanthanum aluminates.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 350-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Topographic Investigations of Domain Structure in Czochralski Grown $Pr_{x}La_{1-x}AlO_{3}$ Crystals
Autorzy:
Wieteska, K.
Wierzchowski, W.
Malinowska, A.
Turczyński, S.
Lefeld-Sosnowska, M.
Pawlak, D.
Łukasiewicz, T.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1538809.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
81.10.Dn
61.72.Ff
Opis:
In the present paper X-ray diffraction topographic techniques were applied to a number of samples cut from Czochralski grown $Pr_{x}La_{1-x}AlO_{3}$ crystals with different ratio of praseodymium and lanthanum. Conventional and synchrotron X-ray topographic investigations revealed differently developed domain structures dependent on the composition of mixed praseodymium lanthanum aluminium perovskites. Some large mosaic blocks were observed together with the domains. In the best crystals, X-ray topographs revealed striation fringes and individual dislocations inside large domains. Synchrotron topographs allowed us to indicate that the domains correspond to three different crystallographic planes, and to evaluate the lattice misorientation between domains in the range of 20-50 arc min.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 268-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defect Structure Formed at Different Stages οf Growth Process in Erbium, Calcium and Holmium Doped $YVO_{4}$ Crystals
Autorzy:
Malinowska, A.
Wierzbicka, E.
Lefeld-Sosnowska, M.
Wieteska, K.
Wierzchowski, W.
Łukasiewicz, T.
Świrkowicz, M.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1538950.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The defect structure of $YVO_{4}$ single crystals doped with $Er^{3+},$ $Ho^{3+}$ and $Ca^{2+}$ were studied by X-ray diffraction topographic methods, using laboratory and synchrotron radiation sources. Variously developed block structure was the dominating imperfection of the investigated crystals observed both in conventional Lang and synchrotron topographs. The evaluation of block misorientation was realised by means of superimposed projection and section white beam synchrotron radiation topographs. More possibilities of following the mutual rotation of blocks were provided by means of white beam synchrotron radiation WBSR projection topographs exposed through the fine mesh.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 328-331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of the Defect Structure in Gadolinum Orthovanadate Single Crystals Grown by the Czochralski Method
Autorzy:
Wierzbicka, E.
Malinowska, A.
Wieteska, K.
Wierzchowski, W.
Lefeld-Sosnowska, M.
Świrkowicz, M.
Łukasiewicz, T.
Paulmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/1431600.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The $GdVO_4$ single crystals, both undoped and doped with erbium or thulium, were studied by means of X-ray diffraction topographic methods exploring laboratory and synchrotron radiation sources. Variously developed block structure, caused probably by thermal stresses, was revealed. The highest crystallographic perfection was observed in the crystal doped with 4 at.% of thulium, which was free of the grain boundaries in the end part. Contrary to that, the differences in structural perfection between samples cut out from various regions of the crystal and for different kinds of doping, were less distinct in other crystals. The diffraction topographic methods enabled the statement that the misorientation between various blocks is in the range of several arc minutes.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 906-909
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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